import java.util.*;
class Example2_5 {
	public static void main(String arg[])  {
		int start = 0, end, middle;
		int a[] = {20165316,Integer.MIN_VALUE,67,89,123,-45,67};
		int N = a.length;
		for(int i=0; i<N; i++) {
			for(int j = i+1; j<N; j++) {
				if(a[j]<a[i]){
					int t = a[j];
					a[j] = a[i];
					a[i] = t;
				}
			}
		}
		Scanner scanner = new Scanner(System.in);
		System.out.println("输入整数，程序判断该整数是否在数组中：");
		int number = scanner.nextInt();
		int count = 0;
		end = N;
		middle=(start+end)/2;
		while(number!=a[middle]){
			if(number>a[middle])
				start = middle;
			else if(number<a[middle])
				end = middle;
			middle = (start+end)/2;
			count++;
			if(count>N/2)
				break;
		}
		if(count>N/2)
			System.out.printf("%d不在数组中.\n",number);
		else
			System.out.printf("%d在数组中.\n",number);
	}
}
